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These are the 4 different types of water sources in medieval Siena.
(Also describe the advantages of using multiple sources-issues linked to reliability, hydrologic and other types of uncertainties, and the water quality requirements associated with different types of water uses)
1. groundwater- wells
2. rainwater- cisterns
3. excavated spring banks- fountains
4. springs- aqueducts
Advantages: reliability in cases of draught and war (natural and political uncertainties). Variations of water quality allows for distinguishing among uses.